<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dom1.0</title>
</head>
<style>
    .red{
        background-color: red;
    }
</style>
<body>
    <div>
    <div id="div66"></div>
    <div id="div1"></div>
    <div id="div11">11111</div>
    <div id="siblings">
        <div id="s1"></div>
        <div id="s2"></div>
        <div id="s3"></div>
    <div id="travel">
            <div id="t1">T1</div>
            <div id="t2">T2</div>
            <div id="t3">T3</div>
    </div>
    <div id="test">
        <div class="red"></div>
        <div class="red"></div>
        <div class="red"></div>
        <div class="red"></div>
        <div class="red"></div>
        <div class="red"></div>
        <div id="r1"></div>
        <div id="r2"></div>
        <div id="r3"></div>
        <div id="r4"></div>
    </div>
</div>
</body>
<!-- <script src="Dom.js"></script>
<script src="main.js"></script> -->
<script src="zuoye.js"></script>
</html>